Oculus World Trade Center

This guide to the Oculus at the World Trade Center traces how the transit hub's white steel ribs came from a single image architect Santiago Calatrava described when he unveiled his design in 2004: a child releasing a dove. It follows the project's ballooning budget, from an original two-billion-dollar estimate to critics calling the finished building the carcass of a Thanksgiving turkey, and the subway line the city refused to close during construction. Listen for how sunlight moves through the building's spine every September eleventh.